Matthews JH, Dinh TD, Tivitmahaisoon P, Ziller JW, Van Vranken DL. Intramolecular ditryptophan crosslinks enforce two types of antiparallel beta structures.
Chem Biol 2001;
8:1071-9. [PMID:
11731298 DOI:
10.1016/s1074-5521(01)00077-1]
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Abstract
BACKGROUND
Two types of biaryl crosslinks can be formed with natural protein sidechains: ditryptophan and dityrosine. Biaryl crosslinks have the same topology as disulfide crosslinks, yet little is known about their effect on local peptide structure.
RESULTS
Three ditryptophan-linked peptide dimers based on the sequence Ac-Leu-Trp-Ala-COX were prepared. The tripeptide dimer with -CONH(2) termini was too insoluble to study, but the tripeptide dimer with -COOMe termini crystallized from methanol/chloroform as an antiparallel beta-sheet. The tripeptide dimer with a -CONMe(2) termini adopted a slipped antiparallel beta structure in methanol/chloroform.
CONCLUSIONS
These results suggest that intermolecular ditryptophan crosslinks that join the middle of peptide chains can confer a preference for antiparallel beta-sheet structure. The effect is most dramatic when both the inside and outside edges of the dimer can form hydrogen bonds as in the crystal structure of dimer 3b.
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